تاثیر صدمات برگی بر عملکرد ریشه و درصد قند چغندر قند

In this project, intensity and time of defoliation and re-cultivation concurrent with defoliation, on sugar beet root yield and its sugar content were studied as a split plot experiment with four replications in Motahhari Station in Karaj in two years, 2010 and 2011. The results showed that the root yield is more sensitive to defoliation in middle growth and establish stages, in the first and second grade respectively, in compare to other growth stages. The lowest sugar content, in early and late seeding date were observed in treatments of 100% defoliation in late and in middle growth stages, respectively, in compare to their control. Root yield in coincided seeding with defoliation treatments was significantly less compared to different defoliation treatments. Then it is recommended that in case of the leaves are just damaged for any reason; eliminate of cropping and re-cultivation are not economical.